205007745 has 16 divisors (see below), whose sum is σ = 331024320. Its totient is φ = 108333504.

The previous prime is 205007741. The next prime is 205007753. The reversal of 205007745 is 547700502.

It is not a de Polignac number, because 205007745 - 2² = 205007741 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (205007741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61059 + ... + 64328.

It is an arithmetic number, because the mean of its divisors is an integer number (20689020).

Almost surely, 2^205007745 is an apocalyptic number.

It is an amenable number.

205007745 is a deficient number, since it is larger than the sum of its proper divisors (126016575).

205007745 is a wasteful number, since it uses less digits than its factorization.

205007745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125504.

The product of its (nonzero) digits is 9800, while the sum is 30.

The square root of 205007745 is about 14318.0915278538. The cubic root of 205007745 is about 589.6442794928.

The spelling of 205007745 in words is "two hundred five million, seven thousand, seven hundred forty-five".